BMR 2200mAh Ultra Slim Lithium Polymer Credit Card Size Portable Power Bank (External Battery Charger) with 2.1A Output for Galaxy S5, S4, S3, Note 3, Nexus 4, HTC One, One 2 (M8), Blackberry, Motorola Droid, Moto X, PS Vita, Gopro and Most USB Devices Ultra Slim & light weight with 2200 mA capacity. Enough to provide battery backup for daily emergency use. No need to be bulky and heavy for power bank. Ultra Slim design that fits easily into small bags and backpacks. Safe:short-circuit and over current protection,The device will automatic shutdown when short circuit or overload output happened to avoid destroy the device and accident